How can I remap the arbotix_gui remap from /cmd_vel to /myrobot_cmd_vel?

edit

I use the arbotix_gui to control /cmd_vel very good.

But I want to change the topic from /cmd_vel to /myrobot_cmd_vel?

I want to use the .launch file.

but I don't know the pkg and type and others?

Now I have more questions about launch?

<launch> <include file="$(find rbx1_bringup)/launch/openni_driver.launch"/>

<node pkg="depthimage_to_laserscan" type="depthimage_to_laserscan" name="depthimage_to_laserscan" output="screen"> <remap from="image" to="/camera/depth/image_raw"/> <remap from="camera_info" to="/camera/depth/camera_info"/> <remap from="scan" to="/scan"/> </node>

</launch>

How can I know the imformation like " <node pkg="depthimage_to_laserscan" type="depthimage_to_laserscan" name="depthimage_to_laserscan" output="screen"> "?

I can use rospack list to list the pkg, but I can not know that the package have (so many name or type or output).

Thanks for your help!